# COCOMO II Cost Calculator

> Cost a COCOMO II effort estimate at your own person-month cost.

Page: https://freecalculator.tech/tools/cocomo-ii-cost-calculator
Last reviewed: 2026-09-16

## Formula

PM = 2.94 × KSLOC^(0.91 + 0.01 × ΣSF) × ΠEM; Cost = PM × Loaded cost per person-month + Non-labour cost

- PM = 2.94 × KSLOC^(0.91 + 0.01 × ΣSF) × ΠEM; Cost = PM × Loaded cost per person-month + Non-labour cost.
- Inputs used: Currency, Size, Sum of the five scale factors, Product of the effort multipliers, Loaded cost of one person-month, Tools, licences and other non-labour cost (optional).
- Edge handling: Size is required.; Size must be greater than zero.; Size must be no more than 100000.; Sum of the five scale factors is required.; Sum of the five scale factors cannot be negative..

## Inputs

- Currency
- Size
- Sum of the five scale factors
- Product of the effort multipliers
- Loaded cost of one person-month
- Tools, licences and other non-labour cost (optional)

## Worked example: 100 KSLOC at your own person-month cost

Published COCOMO II constants with your ratings; the money figure is yours.
1. Start with Currency: USD, Size: 100, Sum of the five scale factors: 18.97, Product of the effort multipliers: 1, Loaded cost of one person-month: 14000, Tools, licences and other non-labour cost (optional): 0.
2. Apply the method: PM = 2.94 × KSLOC^(0.91 + 0.01 × ΣSF) × ΠEM; Cost = PM × Loaded cost per person-month + Non-labour cost.
3. Published COCOMO II constants with your ratings; the money figure is yours.

## Common questions

### Where does this formula come from?

COCOMO II Model Definition Manual — post-architecture effort PM = A × Size^E × ΠEM with A = 2.94 and E = B + 0.01 × ΣSF (B = 0.91), and schedule TDEV = C × PM^(D + 0.2 × (E − B)) × SCED%/100 with C = 3.67 and D = 0.28. See the source link on this page.

### What kind of calculation is this?

The published post-architecture effort equation, costed at the loaded person-month cost the organisation enters. Check the formula, example, and limitations on this page before using the result for a real professional & industry decision.

### What are its limits?

COCOMO II is a calibrated estimation model, not an exact prediction; its published accuracy is a range, not a point. Estimates are only as good as the size, scale factors and effort multipliers entered.

### How do I use the COCOMO II Cost Calculator?

Enter the required values for Currency, Size, Sum of the five scale factors, Product of the effort multipliers, Loaded cost of one person-month, and the other fields shown. The calculator applies the formula on this page and shows the main result with any supporting breakdown so you can check the arithmetic.

### What formula does the COCOMO II Cost Calculator use?

PM = 2.94 × KSLOC^(0.91 + 0.01 × ΣSF) × ΠEM; Cost = PM × Loaded cost per person-month + Non-labour cost The visible formula section above lists the calculation path and the edge cases the page handles, so the result can be checked without relying on the form alone. Check the formula, example, and limitations on this page before using the result for a real professional & industry decision.

### Can the COCOMO II Cost Calculator be used for exact decisions?

Use it as a calculation aid, not as a substitute for checking the underlying rule, contract, policy, or professional advice that applies to your situation. When a result depends on local rules, personal details, prices, or dates, enter those values yourself and confirm them before acting.

## Limitations and assumptions

- Inputs outside the supported range are rejected rather than forced into a result.
- The result depends on the values you enter for this cocomo ii cost calculator; it does not supply missing rates, rules, prices, dates, or assumptions for you.

## Sources

- University of Southern California, Center for Systems and Software Engineering — https://csse.usc.edu/tools/cocomo/

## Cite this page

- APA: Free Calculator. (2026, September 16). COCOMO II Cost Calculator. https://freecalculator.tech/tools/cocomo-ii-cost-calculator
- MLA: "COCOMO II Cost Calculator." Free Calculator, 16 Sept. 2026, https://freecalculator.tech/tools/cocomo-ii-cost-calculator.
- Link: COCOMO II Cost Calculator — Free Calculator, https://freecalculator.tech/tools/cocomo-ii-cost-calculator